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第八章“功和能” 功和能是物理学的两个基本概念。在这一章里讲功和能的初步知识,这些知识在初三学习热学和电学时都要用到,是进一步学习的必要基础,是初二物理的重要内容。本章重点讲功的知识,能的知识只作初步介绍。在讲功的知识时,以功和功率的概念为基础,重点讲功的原理和它的应用,从功的原理进一步引出机械效率的概念。在讲能的知识时,主要介绍能的初步概念,动能、势能的相互转化
The eighth chapter “work and energy” works and energy are two basic concepts of physics. In this chapter, we will discuss the preliminary knowledge of energy and energy. These knowledge must be used when studying thermal science and electricity in the third year. It is a necessary basis for further study and is an important part of the second physics. This chapter focuses on the knowledge of lectures, but the knowledge of energy is only for preliminary introduction. When lecturing knowledge, based on the concept of work and power, focusing on the principle of work and its application, the principle of work further leads to the concept of mechanical efficiency. When we talk about energy, we mainly introduce the preliminary concept of energy, and the mutual transformation of kinetic energy and potential energy.